Re: OSPF problem..pls help.

I think Serial0/0/0 is already on another area and due to dynamic FR Mapping
its getting this packet from 1.1.24.2 which is in Area 2 on this interface
while it should get it on Serial0/1/0

----- Original Message -----
From: "Steve Lyons" <charter21p5_at_gmail.com>
To: "Divin Mathew John" <divinjohn_at_gmail.com>
Cc: "Naufal Jamal" <naufalccie_at_yahoo.in>; <ccielab_at_groupstudy.com>
Sent: Sunday, September 13, 2009 4:11 PM
Subject: Re: OSPF problem..pls help.

> Good catch. I didn't even notice. :) Check your configuration on both
> sides. It appears you have a mismatch of area type.
>
> router ospf 1
> log-adjacency-changes
> network 1.1.4.4 0.0.0.0 area 0 <====== does this match on the other side.
>
>
> Keep in mind the ospf hello packet has an area-id field and if this does
> not
> match on both sides then the adjacency will not be formed.
>
> Below is an example of packet structure I found searching google:
>
> http://routemyworld.com/wp-content/uploads/2008/07/ospf-packet-header.jpg
>
> Also here is some reading on why neighbors might not form:
>
> http://supportwiki.cisco.com/ViewWiki/index.php/OSPF_routers_do_not_form_neighbor_relationship_due_to_a_mismatch_in_hello_parameters
>
> Steve Lyons
>
>
>
>
> On Sun, Sep 13, 2009 at 8:56 AM, Divin Mathew John
> <divinjohn_at_gmail.com>wrote:
>
>> *Sep 13 11:20:38.243: OSPF: Rcv pkt from 1.1.24.2, Serial0/0/0, area
>> 0.0.0.0
>> mismatch area 0.0.0.2 in the header??
>>
>>
>> On Sun, Sep 13, 2009 at 6:19 PM, Steve Lyons
>> <charter21p5_at_gmail.com>wrote:
>>
>>> Ping 224.0.0.5 and source it from the ptp interface. Let me know if you
>>> get
>>> a response.
>>>
>>> Steve Lyons
>>>
>>> On Sun, Sep 13, 2009 at 6:16 AM, Naufal Jamal <naufalccie_at_yahoo.in>
>>> wrote:
>>>
>>> > Hi,
>>> >
>>> > I have a full-mesh of ospf network but having problems between R4 and
>>> > R2
>>> > point-to-point network type .here is the config/debug on both the
>>> > routers.the
>>> > neighbourship never comes up.
>>> >
>>> >
>>> > R4
>>> >
>>> > interface Serial0/1/0
>>> > ip address 1.1.24.4 255.255.255.0
>>> > encapsulation frame-relay
>>> > ip ospf network point-to-point
>>> > frame-relay map ip 1.1.24.4 402
>>> > frame-relay map ip 1.1.24.2 402 broadcast
>>> > no frame-relay inverse-arp
>>> > end
>>> >
>>> > R4
>>> >
>>> > (config-if)#do debug ip ospf ev
>>> > OSPF events debugging is on
>>> > R4(config-if)#
>>> > *Sep 13 11:20:38.131: OSPF: Send hello to 224.0.0.5 area 2 on
>>> Serial0/1/0
>>> > from
>>> > 1
>>> > .1.24.4
>>> > *Sep 13 11:20:38.243: OSPF: Rcv pkt from 1.1.24.2, Serial0/0/0, area
>>> > 0.0.0.0
>>> > mismatch area 0.0.0.2 in the header
>>> >
>>> > sh ip ospf ne
>>> > Neighbor ID Pri State Dead Time Address
>>> Interface
>>> > 1.1.3.3 1 FULL/DROTHER 00:01:51 1.1.100.3
>>> > Serial0/0/0
>>> > 1.1.6.6 1 FULL/BDR 00:01:47 1.1.100.6
>>> > Serial0/0/0
>>> >
>>> > router ospf 1
>>> > log-adjacency-changes
>>> > network 1.1.4.4 0.0.0.0 area 0
>>> > network 1.1.24.4 0.0.0.0 area 2
>>> > network 1.1.100.4 0.0.0.0 area 0
>>> > neighbor 1.1.100.3
>>> > neighbor 1.1.100.6
>>> >
>>> > R2
>>> >
>>> >
>>> > R2(config-if)#
>>> > *Mar 1 16:50:33.663: OSPF: Send hello to 224.0.0.5 area 2 on
>>> > FastEthernet0/0
>>> > fr
>>> > om 1.1.26.2
>>> > *Mar 1 16:50:34.491: OSPF: Rcv hello from 1.1.4.4 area 2 from
>>> > Serial0/0
>>> > 1.1.24.
>>> > 4
>>> > *Mar 1 16:50:34.491: OSPF: Send immediate hello to nbr 1.1.4.4, src
>>> > address
>>> > 1.1
>>> > .24.4, on Serial0/0
>>> > *Mar 1 16:50:34.495: OSPF: Send hello to 224.0.0.5 area 2 on
>>> > Serial0/0
>>> > from
>>> > 1.1
>>> > .24.2
>>> > *Mar 1 16:50:34.495: OSPF: End o
>>> > *Mar 1 16:58:55.403: OSPF: Rcv hello from 1.1.6.6 area 2 from
>>> > FastEthernet0/0
>>> > 1
>>> > .1.26.6
>>> > *Mar 1 16:58:55.403: OSPF: End of hello processing
>>> > R2(config-if)#
>>> > R2(config-if)#do
>>> > *Mar 1 16:58:58.567: OSPF: Send hello to 224.0.0.5 area 2 on
>>> > Serial0/0
>>> > from
>>> > 1.1
>>> > .24.2
>>> > R2(config-if)#do u all
>>> > All possible debugging has been turned off
>>> > R2(config-if)#do sh ip ospf ne
>>> > Neighbor ID Pri State Dead Time Address
>>> Interface
>>> > 1.1.4.4 0 INIT/ - 00:00:32 1.1.24.4
>>> Serial0/0
>>> > 1.1.6.6 1 FULL/BDR 00:00:33 1.1.26.6
>>> > FastEthernet0/0
>>> >
>>> > interface Serial0/0
>>> > ip address 1.1.24.2 255.255.255.0
>>> > encapsulation frame-relay
>>> > ip ospf network point-to-point
>>> > frame-relay map ip 1.1.24.2 204
>>> > frame-relay map ip 1.1.24.4 204 broadcast
>>> > no frame-relay inverse-arp
>>> > frame-relay lmi-type cisco
>>> > end
>>> >
>>> > router ospf 1
>>> > log-adjacency-changes
>>> > network 1.1.2.2 0.0.0.0 area 2
>>> > network 1.1.24.2 0.0.0.0 area 2
>>> > network 1.1.26.2 0.0.0.0 area 2
>>> >
>>> > neighborship with R3 and R6 is o.k dont understand why it is not comin
>>> up
>>> > between R2 and R4 p2p link...
>>> >
>>> > Thanks,
>>> > Naufal
>>> >
>>> >
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>>
>>
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>>
>>
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>> better to have a permanent income than to be fascinating."
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Received on Sun Sep 13 2009 - 15:20:57 ART